Envelope



UNITED STATES PATENT OFFICE.

GEORGE I-I. MARTIN, OF SAN FRANCISCO, CALIFORNIA.

ENVELOPE.

SPECIFICATION forming part of Letters Patent No. 519,864, dated; May 15, 1894.

Application filed January 30, 1 894. Serial No.498,492- (No model.)

To aZZ whom it may concern:

Be it known that I, GEORGE H. MARTIN, a citizen of the United States, residing in the city and county of San Francisco, State of California, have invented an Improvement in Envelopes; and I hereby declare the following to be a full, clear, and exact description of the same.

My invention relates to improvements in letter envelopes.

It consists in certain details of construction which will be more fully explained by reference to the accompanying drawings, in which- Figure 1 is a view of the sheet of paper out the proper shape to form my improved envelope. Fig. 2 is a View showing the manner of closing and uniting the flaps ready for use. Fig. 3 is a front view of the envelope closed.

The object of my invention is to provide an envelope for the inclosing of letters and papers, an improved method of cutting the paper so as to economize the stock from which the envelopes are cut, and an improved manner of overlapping and joining the end flaps upon the opposite sides so as to make a double thickness of the material and make the envelope opaque, and a safety device for the envelope when sealed.

A and B are the parts which-form the two opposite sides of the envelope, and C and D are the flaps which fold over and form the ends, while E is a closing flap formed upon one side which serves for a final closing of the envelope. The flaps C and D form extensions respectively of the sides A and B, one extending from one end of one of the sides, while the other extends from the opposite end of the other side. These flaps are made of any suitable or desired length. They may be made to extend to the middle of the sides, or, if preferred, long enough to cover the whole length of the sides when folded upon them, in which case both sides of the envelope would have a double thickness and be made entirely opaque. It will be seen that by the peculiar construction with the flaps C and D upon opposite alternate ends of the sides A and B, these blanks maybe cut out from sheets of paper so that they interlock with each other and produce the envelopes with a minimum of waste.

When the parts A and B are folded upon a line a between them, the flaps C and D are folded upon the lines I) to lie inside of the sides A and B. A proper adhesive solution is applied to the exterior of both of these flaps, and the flap C is pasted along the inside of the opposing side B, while the flap D is correspondingly pasted along the inner face of the side A, thus forming the closed ends of the envelope, and at the same time thickening or reinforcing the sides to any desired extent, up to the complete covering of the whole of the side.

The flap E may be of any suitable or desired shape and is covered with an adhesive material so that when the envelope is closed it may be sealed in the usual manner. It is preferably made short having sufficient space below it for the superscription and address, and the stamp is applied so as to cross the line of junction of the flap and body, thus serving as a safety device against surreptitious opening of the envelope. By thus constructing the flaps with lines of junction and folding at right angles and corresponding with the sides and ends of the envelope, it is better fitted for addressing upon a typewriter, as it presents no diagonal lines, which in the ordinary form of envelope cause dimculty by throwing the type out of line and deranging the action of the machine.

The back of the envelope is left smooth and free for advertising and other matters.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-- 1. An envelope consisting of the sides each having an extension formed with it upon the opposite end from the extension upon the other side, said extensions being folded to form end flaps, and adapted to be pasted within the opposing sides when the envelope is closed, substantially as herein described.

2. An envelope consisting of a sheet folded longitudinally to form equal sides, extensions or flaps upon oppesite ends of thesetwo sides, In witness whereof I have hereunto set my folded at right angles with the longitudinal hand. fold adapted to lie within the sides and form the ends of the envelope, said folded flaps GEORGE MARTIN 5 being pasted to the opposite sides from those Witnesses:

with which they are formed, substantially as SHELDON G. KELLOGG,

herein described. WILLIAM F. GIBSON. 

